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Dissertations / Theses on the topic 'Nitrogen Fixation'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Supeno. "Sonochemical fixation of nitrogen." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ57783.pdf.

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2

Supeno, Carleton University Dissertation Chemistry. "Sonochemical fixation of nitrogen." Ottawa, 2000.

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3

Klawonn, Isabell. "Marine nitrogen fixation : Cyanobacterial nitrogen fixation and the fate of new nitrogen in the Baltic Sea." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-122080.

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Biogeochemical processes in the marine biosphere are important in global element cycling and greatly influence the gas composition of the Earth’s atmosphere. The nitrogen cycle is a key component of marine biogeochemical cycles. Nitrogen is an essential constituent of living organisms, but bioavailable nitrogen is often short in supply thus limiting primary production. The largest input of nitrogen to the marine environment is by N2-fixation, the transformation of inert N2 gas into bioavailable ammonium by a distinct group of microbes. Hence, N2-fixation bypasses nitrogen limitation and stimul

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4

H, Boström Kjärstin. "Nitrogen fixation among marine bacterioplankton." Doctoral thesis, Högskolan i Kalmar, Naturvetenskapliga institutionen, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-24.

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While bacterioplankton indisputably control vital biogeochemical paths in the cycling of carbon and nutrients in the world’s oceans, our knowledge about the functional and genetic diversity of bacterioplankton communities is negligible. In this thesis, molecular and more traditional microbiological methods were used to study the specific function of N2-fixation and in a general sense diversity of marine bacterioplankton species. Most oceans are nitrogen limited and, therefore, adaptive to bacterioplankton capable of N2-fixation. Recent studies have found nifH genes (coding for the nitrogenase

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5

Crosswhite, F. S., and C. D. Crosswhite. "Nitrogen Fixation in Desert Legumes." University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/609108.

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6

Monteiro, Fanny. "Mechanistic models of oceanic nitrogen fixation." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53104.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2009.<br>Includes bibliographical references (p. 163-185).<br>Oceanic nitrogen fixation and biogeochemical interactions between the nitrogen, phosphorus and iron cycles have important implications for the control of primary production and carbon storage in the ocean. The biological process of nitrogen fixation is thought to be particularly important where the ocean is nitrogen limited and oligotrophic. This thesis examines some of the mechanisms responsible for the distribution, rates a

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7

Abdel, Magid H. M., P. W. Singleton, and J. W. Tavares. "Sesbania-Rhizobium Specificity and Nitrogen Fixation." University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/609114.

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The compatibility of potentially nitrogen fixing associations between ten Rhizobium strains and six Sesbania accessions (species) was studied under glasshouse conditions. The rates of N₂ (C₂ H₂) fixation (u moles C₂ H₄ /plant/h) were determined. The various Sesbania accessions responded differently to inoculation with the strains tested. The ANOVA test revealed that there are real accessions (P = 0.01) and strains (P = 0.05) differences. In general the results obtained indicated that the highest mean rate of N₂ (C₂ H₂) fixation and the highest degree of compatibility with strains under test wa

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8

Nagel, Eric Dale. "Nitrogen fixation in benthic microalgal mats." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2092.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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9

Cheng, J. "Interactions between nitrogen fixation and alternative sources of nitrogen in Gloeothece." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636244.

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When grown under constant illumination, <I>Gloeothece</I> ATCC 27152, a unicellular cyanobacterium, can use nitrate, nitrite, dinitrogen or ammonium as the sole N-source for growth. The uptake systems for nitrate and nitrite were fully active and ammonium-repressible in N<SUB>2</SUB>-fixing cultures. Nitrite uptake was mediated via two pH-dependent systems: passive diffusion of HNO<SUB>2</SUB> and active transport of nitrite. Nitrate uptake was highly light-dependent. Ammonium was also transported by passive diffusion of ammonia and active uptake of ammonium, depending on the pH of the medium.

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10

Mansur, Irdika. "Nitrogen uptake dynamics and biological nitrogen fixation in a silvopastoral system." Thesis, University of Canterbury. Department of Forestry, 1994. http://hdl.handle.net/10092/4243.

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Two sets of field experiment were conducted at the Lincoln University's agroforestry trial. The first experiment was to study nitrogen (N) uptake by radiata pine and pasture, and soil total N changes with time. The second experiment was to assess the magnitude of input from biological nitrogen fixation (BNF) and factors affecting BNF. Lucerne was found to be the most severe competitor with trees. It reduced tree height, root collar diameter and diameter at breast height, and occasionally reduced fascicle dry weight and foliar N content. However, lucerne had a high dry matter yield (DMY), nitro

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11

Kahindi, James H. P. "Efficiency of nitrogen fixation in Azotobacter chroococcum." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358929.

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12

Allan, Caroline Elizabeth. "Nitrogen fixation in riverine wetland plant communities." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297033.

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13

Pakseresht, Nima. "An in silico investigation into nitrogen fixation." Thesis, University of East Anglia, 2010. https://ueaeprints.uea.ac.uk/19406/.

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14

Sanyal, Debankur. "Symbiotic Nitrogen Fixation in Dry Bean Cultivars." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/27850.

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Dry Beans (Phaseolus vulgaris L.), is the second-most important grain legume, and North Dakota has ranked first in dry bean production. The overarching research question of my project is whether we can increase the nitrogen (N) fixing potential of dry bean cultivars with inoculation and compare the nitrogen (N) fixing potential of common dry bean cultivars. Field experiment was conducted to compare peat and liquid inoculants during 2016 and 2017 growing seasons. In the field study, N2 fixation was estimated by stable isotope (15N) dilution technique. Liquid inoculant (70.5?5.9 kg ha-1) showed

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15

Karriem, Fatiema. "Oxidative fixation of dinitrogen by photocatalysis." Thesis, University of Western Cape, 2000. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5777_1267648612.

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16

Zhou, Maoqian 1961. "Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277231.

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The growth and Nitrogen fixation by one low salt tolerant alfalfa (Medicago sativa L.) and two germination salt tolerant selections inoculated with were investigated at two salt levels (0, -0.6 Mpa) and two N rates (1, 5ppm) using a system which automatically recirculates a nutrient solution. The high level of salinity (-0.6 Mpa osmotic potential of culture solution) resulted in substantial reduction in the N fixation percentage and total fixed N. The effect of salinity was more pronounced for later cuttings than for the earlier cutting. The N fixation percentages were substantially decreased

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17

Bradburn, Mark James. "Light and planktonic nitrogen fixation in Colorado reservoirs." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442959.

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18

Ghalamboran, M. R. "Symbiotic nitrogen fixation enhancement due to magnetite nanoparticles." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/8172.

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Population pressure on food production motivates the search for new ways to increase the productivity of arable land, especially land rendered marginal by salinity or aridity. The global thesis motivating this work is that nanotechnology can benefit agriculture. My specific thesis is that that part of nanotechnology concerned with nanoparticle production can benefit soybean yield. I have focused on symbiotic nitrogen fixation, and systematically investigated the effects thereon of magnetite nanoparticles introduced into the rhizosphere. My main finding is that the presence of these nanoparticl

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19

Chan, Y. S. Gilbert. "Nitrogen fixation by leguminous plants under landfill conditions." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/1702/.

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20

Wang, He. "Metabolic regulation of nitrogen fixation in Rhodospirillum rubrum /." Stockholm : Department of biochemistry and biophysics, Stockholm university, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-29404.

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Diss. (sammanfattning) Stockholm : Stockholms universitet, 2009.<br>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 4: Submitted. Härtill 4 uppsatser.

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21

Amiri, Alireza Agha. "Regulation of nitrogen fixation in rhizobia-legume symbioses." Thesis, Amiri, Alireza Agha (2021) Regulation of nitrogen fixation in rhizobia-legume symbioses. Honours thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/63559/.

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Rhizobia are soil-dwelling bacteria capable of infecting legume roots and forming a symbiotic association. Inside root nodules, low O2 levels trigger expression of the nitrogenase enzyme complex in rhizobia, allowing them to fix atmospheric N2 into NH3, and secrete this reduced nitrogen source to the host plant. Rhizobial N2 fixation is activated via the transcriptional regulator NifA, which is itself induced by low O2 concentration in legume root nodules, most commonly via the two-component sensor-regulator FixLJ or a modified version of this regulon. For rhizobia in the genus Mesorhizobium,

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22

Lestari, Yulin. "Nodulation and nitrogen fixation in Medicago species at low pH." Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phl6418.pdf.

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23

Denton, Matt. "The influence of naturalised Rhizobium leguminosarum bv. trifolii populations on the nodulation of alternative clovers (Trifolium spp.) in alkaline soils / Matt Denton." Thesis, Adelaide, Sth. Aust, 2000. http://hdl.handle.net/2440/22423.

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24

Denton, Matt. "Influence of naturalised Rhizobium leguminosarum bv. trifolii populations on the nodulation of alternative clovers (Trifolium spp.) in alkaline soils / Matt Denton." Adelaide, Sth. Aust, 2000. http://hdl.handle.net/2440/22423.

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Bibliography: leaves 186-209.<br>xiii, 218 leaves : ill. (some col.), 1 col. map ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--Adelaide University, Dept. of Agronomy and Farming Systems, 2000

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25

Horak, Rachel Elizabeth Ann. "Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37238.

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Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an N-poor C-rich (wooden) diet. Shipworm symbionts are known to fix N within the gill habitat and newly fixed N is subsequently incorporated into non-symbiont containing host tissue. The presence of N2-fixation in gill bacteriocytes presents a conundrum because N2-fixation is tightly regulated by oxyge

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26

Abi-Ghanem, Rita. "Optimizing biological nitrogen fixation and evaluating Iraqi extension education." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Summer2009/R_Abi-Ghanem_070909.pdf.

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27

Kessler, Peter S. "Nitrogen fixation in the mesophilic marine archaeon Methanococcus maripaludis /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11520.

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28

Gier, Jessica [Verfasser]. "Benthic nitrogen fixation in oxygen minimum zones / Jessica Gier." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/1098185048/34.

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29

Sanders, Ian. "Factors affecting symbiotic nitrogen fixation in organic farming systems." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/27337.

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Nitrogen (N) fixation by white clover (Trifolium repens L.) was measured in the ley phases of three experimental organic ley-arable rotations at two sites, between 1997 and 2000, using the 15N dilution technique. Soil nitrate-N, ammonium-N, and total soluble N were measured at one of the sites between 1999 and 2001. Variation of soil N was assessed in different ages of ley, year, month, rotation, site and microsite type (grass or clover). Data for soil pH, organic matter, P, K, and Mg, was also compared, as was weather data for the period. Variation of N fixation, grass and clover dry matter,

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30

Carlsson, Georg. "Input of nitrogen from N2 fixation to northern grasslands /." Umeå : Dept. of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200576.pdf.

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31

Burity, Helio Almeida. "Nitrogen fixation, transfer and competition in alfalfa-grass mixtures." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73959.

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32

Rajab, T. M. A. "Studies on carbon metabolism and nitrogen fixation by Gloeothece." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638610.

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When cultures of <i>Gloeothece</i> grown under constant light, were transferred to dark anerobic conditions, the rate of acetylene reduction dropped within 1h to 25-30% of that in the light, and reached a minimum after 10-12h. The only source at ATP for nitrogenase, under such conditions, is substrate level phosphorylation utilising endogenous material. All attempts to support N<SUB>2</SUB>-fixation by an exogenous source of energy proved unsuccessful. Although <i>Gloeothece</i>was able to fix nitrogen under dark anaerobic conditions, no nitrogenase synthesis was observed. <i>Gloeothece</i> su

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33

Oagile, Otsoseng. "African yam bean : morphology, clonal propagation and nitrogen fixation." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/12946/.

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Morphological and growth observations made on landraces of African yam bean (AYB) used in this study confirm that this species is the most morphologically variable in the genus (Potter, 1992). Morphological characters such as seed colour, stem colour, internode length, leaf size and number of leaves per plant were found to vary between landraces. Growth and development was controlled by both genotype and environment. Flowering was observed only when plants were grown at 25°C, rather than at 30°C, with a 12 h photoperiod. Tuber formation occurred only in AYBS and not in other landraces. Growth

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34

Islam, M. D. Rafiqul. "Nitrogen fixation by a Bangladesh deepwater rice-field Calothrix." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6180/.

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In order to study the influence on blue-green algal nitrogenase activity of environmental variables in deepwater rice-fields (DWR), a laboratory study was planned on a DWR isolate of Calothrix (D764). The variables chosen were light, oxygen, combined nitrogen, phosphorus and iron. As availability of P is likely to play an especially important role for growth and nitrogen fixation in DWR, studies on phosphatase activity of the isolate were also included. The method used for measuring nitrogenase activity was acetylene reduction assay (ARA). In order to convert nitrogenase activity to nitrogen f

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35

Webb, Isabel. "Characterisation of the fixABCX operon in symbiotic nitrogen fixation." Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/63286/.

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The fixABCX genes are essential for nitrogen fixation in R. leguminosarum bv. viciae 3841. Comparison of FixABCX to homologous proteins across the Kingdoms of Life suggests a role in electron transport to nitrogenase, which requires eight electrons per molecule of dinitrogen fixed. Mutation of this operon leads to bacteroids unable to fix nitrogen in symbiosis with P. sativum (pea). Electron microscopy revealed a drastically altered bacteroid morphology in fixAB mutants, revealing insights into the developmental response of both plant and bacteria to a lack of nitrogen fixation. Observations f

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36

Crank, Susan Frances. "A host specific nitrogen fixation mutant of Bradyrhizobium (Arachis)." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46732.

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37

Lok, Eng Hai. "Nutrition and nitrogen-fixation in Malaysian Pterocarpus Indicus willd." Thesis, Lok, Eng Hai (2011) Nutrition and nitrogen-fixation in Malaysian Pterocarpus Indicus willd. PhD thesis, Murdoch University, 2011. https://researchrepository.murdoch.edu.au/id/eprint/5831/.

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Pterocarpus indicus is a promising tropical woody legume for the establishment of forest plantations in Malaysia. Woody legumes that form symbiotic relationships with nitrogen-fixing bacteria also play an important role for forest restoration on degraded land. Although P. indicus has been widely planted as an amenity tree in SE Asia, its silvicultural requirements have not been determined. There are no recommendations for fertilizer or for inoculation with nitrogen-fixing bacteria. This thesis explores the phosphorus (P) and nitrogen (N) requirements of seedlings and identifies a range of nitr

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38

MOHAMED, IBRAHIM ELBASHIR. "EFFECTS OF PRE-PLANT APPLICATION OF NITROGEN FERTILIZER ON SYMBIOTIC NITROGEN FIXATION AND YIELD OF COWPEAS (VIGNA UNGUICULATA (L.) WALP.)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187957.

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The responses of two cowpea (Vigna unguiculata (L.) Walp.) cultivars inoculated with granular inoculum (a mixture of rhizobia) at different levels of applied nitrogen were evaluated. California Blackeye 5 (Ca5) and Knuckle Purple Hull (KPH) cowpeas were examined under field conditions for percent nodulation, nodule number, and nodule mass per plant, and nitrogenase activity at various times during the 1983 and 1984 growing seasons. Data were also obtained for shoot and root dry weights, seed yield, and protein content. Significant differences between inoculated and uninoculated plots were foun

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39

Burgoyne, Tricia A. "Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests of western Montana." Connect to this title online, 2007. http://etd.lib.umt.edu/theses/available/etd-05302007-085002/.

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40

Svedén, Jennie B. "Cyanobacterial Nitrogen Fixation in the Baltic Sea : With focus on Aphanizomenon sp." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-132773.

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Cyanobacteria are widely distributed in marine, freshwater and terrestrial habitats. Some cyanobacterial genera can convert di-nitrogen gas (N2) to bioavailable ammonium, i.e. perform nitrogen (N) fixation, and are therefore of profound significance for N cycling. N fixation by summer blooms of cyanobacteria is one of the largest sources of new N for the Baltic Sea. This thesis investigated N fixation by cyanobacteria in the Baltic Sea and explored the fate of fixed N at different spatial and temporal scales. In Paper I, we measured cell-specific N fixation by Aphanizomenon sp. at 10 ºC, early

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41

Park, Rosa. "Investigating new reactions for coordinated dinitrogen." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2344.

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The chemistry of the tantalum dinitrogen complex ([NPN]Ta)₂(μ-H)₂(μ-η¹:η²-N₂)Ta-[NPN], 1, (where [NPN] represents the acyclic tridentate ligand [(PhNSiMe₂CH₂)₂-PPh]²-), with primary alkenes, group IV and V metallocene complexes, and GaCp* is explored. The reaction of 1 with 1-pentene and 1-hexene occurs via olefin-insertion into the metal-hydride bond to give two new complexes, ([NPN]Ta(CH₂)₄CH₃)₂(μ-η¹:η¹-N₂), 10, and ([NPN]Ta(CH₂)₅CH₃)₂(μ-η¹:η¹-N₂), 11, which were characterized using NMR spectroscopy. The solid-state structure of 11 was established and revealed that N₂

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42

Beeson, Keri Elizabeth. "Differentiation of plasmids in marine diazotroph assemblages determined by randomly amplified polymorphic DNA analysis." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/25366.

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43

Harris, Sharman Donna. "Synthesis and investigation of some new complexes of molybdenum (II) and tungsten (II) containing sulphur donor ligands." Thesis, Bangor University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262486.

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44

Jones, Clare. "Expression of FixAB : a putative member of the electron transfer flavoprotein superfamily." Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365028.

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45

Jepson, Brian John Nicholas. "Characterisation of anfa, the transcriptional activator of the FE-nitrogenase from Aztobacter vinelandii." Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251439.

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46

Cheng, Qi. "Studies in the expression and function of Klebsiella pneumoniae nitrogenase iron protein in the chloroplast of the eukaryotic unicellular green algae - Chlamydomonas reinhardtii." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302041.

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47

Brewin, Brett. "Mechanism of ammonium excretion in NifL mutants of Azotobacter vinelandii." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323244.

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48

Alias, Yatimah. "Molybdenum-nitrogen chemistry : electrochemical ligand cleavage and coupling reactions; routes to chiral complexes." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267707.

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49

Naab, JB, SMB Chimphango, and FD Dakora. "N2 fixation in cowpea plants grown in farmers' fields in the Upper West Region of Ghana, measured using 15N natural abundance." Symbiosis, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001478.

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Abstract Few studies have assessed the levels of symbiotic N nutrition in legumes grown by fanners in Africa. In this study, the shoots of cowpea plants were sampled from 63 farms in 12 villages within 5 districts of the Upper West Region of Ghana, and assessed for growth and symbiotic N nutrition. The data revealed considerable differences in cowpea plant density per m2 , plant growth, 15N natural abundance (OI5N), %Ndfa, and N-fixed among different farms under one village, and between villages under the same district, and between districts in the Upper West Region. In farms where there were

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50

Edwards, Robert A. "The role of uridylytransferase in the regulation of nitrogen control in Klebsiella pneumoniae." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239114.

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